What is wrong in it?

HTML-CSS
1

Tell us what’s happening:

Your code so far


<style>
  .injected-text {
    margin-bottom: -25px;
    text-align: center;
  }

  .box {
    border-style: solid;
    border-color: black;
    border-width: 5px;
    text-align: center;
  }

  .yellow-box {
    background-color: yellow;
    padding: 20px 40px 20px 40px;
  }
  
  .red-box {
    background-color: crimson;
    color: #fff;
    padding: 20px 40px 20px 40px;
  }

  .blue-box {
    background-color: blue;
    color: #fff;
    padding: 40px, 20px, 20px, 40px;
  }
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
  <h5 class="box red-box">padding</h5>
  <h5 class="box blue-box">padding</h5>
</div>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-css/use-clockwise-notation-to-specify-the-padding-of-an-element/

2

don’t use separators for padding in blue-box

 padding: 40px 20px 20px 40px;